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ON Semiconductor has introduced a GreenPoint open reference design for a 16-watt (W) ac/dc adapter for xDSL modems. This design exceeds ENERGY STAR requirements for single-voltage ac/dc and ac/ac external power supplies revision 1.1, for high active-mode power efficiency and low standby-mode power consumption. The reference design can also be easily modified for use with 10-20 W, single output-voltage adapters for printers, routers, and hubs.

This fully-implemented and tested solution achieves active-mode efficiency of 78 percent at 120 Vac and 79 percent at 230 Vac, exceeding ENERGY STAR guidelines of 74 percent for both input voltages. In standby-mode, the solution consumes only 240 milliwatts (mW) at 120 Vac and 200 mW at 240 Vac, exceeding ENERGY STAR guidelines of 0.5 W for both input voltages. In addition, the design complies with FCC Part 15 Level B EMI requirements.

• 16 W Adapter Documentation Package
• 16 W, 12 Vdc Modem Power Supply